Whether you purchased a great office chair or a cheap one, the wheels will pick up all sorts of dirt and grime. You can brush a lot of it off, but home and technology blog Apartment Therapy Tech recommends a butter knife for a more effective, thorough cleaning that will keep your chair rolling smooth:

You spend hours at a time at your desk, so hopefully you're sitting in a comfortable chair. If …
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Bust out the butter knife for stuck-on stubborn material. Angle your knife nearly parallel with the wheels, holding it steady, but "slicing" in the same directions as the wheels spin. Spreading onto toast afterward is not recommended.

For additional tips on getting the grime off your task chair's wheels, hit up Apartment Therapy Tech for the full post.